CN1333474C - Preparation method of spinel lithium titanate nano tube/wire for lithium battery and capacitor - Google Patents
Preparation method of spinel lithium titanate nano tube/wire for lithium battery and capacitor Download PDFInfo
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Abstract
The present invention discloses a preparation method for spinel lithium titanate nanometer tubes/wires used in lithium batteries and capacitors, which belongs to the field of nanometer material preparation technology and energy. The method comprises the following steps: using cheap industrial production TiO2 as raw materials, and using an ultrasonic chemistry method to prepare titanate nanometer tubes/nanometer wires; then, using the titanate nanometer tubes/nanometer wires as raw materials to be mixed with a certain quantity of soluble lithium salt aqueous solution, and roasting in the air by a low-temperature hydrothermal ion exchange method to prepare spinel lithium titanate nanometer tubes/nanometer wires with homogeneous appearances, uniform tube diameters, larger slenderness ratio and large specific surface area. The products have wide application prospects in the field of energy, such as novel lithium ion secondary batteries, super capacitors, etc. The method has the advantages of mild and controllable reaction conditions and low energy consumption, has an environment friendly green synthesis course, and also has the advantages of cheap and easily obtained materials, high yield and easy realization of large-scale production.
Description
Technical field
The invention belongs to nano material preparation technology and energy field.Be particularly related to the spinel lithium titanate nanotube/line preparation method who is used for lithium battery and capacitor.
Technical background
In recent years, spinel type lithium titanate comes into one's own day by day as the electrode material of novel energy storage cell, this is because the lattice constant of spinel type lithium titanate before and after lithium ion inserts and deviates from changes very little, be called " zero strain material " that lithium ion inserts, thereby can have excellent cyclical stability, simultaneously, characteristics such as lithium titanate also has the anti-over-charging performance and thermal stability is good, safe and specific capacity is big, be a kind of novel battery material of excellence, be widely used in the energy-storage battery field.Lithium titanate is with respect to the electromotive force of lithium metal lower (being about 1.5V), therefore it can be as the negative material of lithium ion battery, form the lithium ion battery of 3V level with the positive electrode of 4.5V level, can be used for substituting the existing occasion of using by two joint dry cell series connection, simultaneously, it also can be with directly as anodal, and the lithium ion battery of forming the 1.5V level with lithium metal or lithium alloy negative pole uses.Along with further developing and the application of nanoelectronic technology in the IC device of microelectric technique, the further raising of the integrated level of IC device, its operating voltage will further reduce, and therefore, the battery of this high power capacity, low-voltage also is a kind of trend of development.Simultaneously, spinel type lithium titanate can also be applied to the electrode material of ultracapacitor, and ultracapacitor provides the important energy storage device of high power density, has broad application prospects in fields such as electric automobile and hybrid vehicles.
The synthetic method of spinel lithium titanate is many, and high temperature solid-state method is arranged usually, the high-energy ball milling method gel method.
High temperature solid-state method: human high temperature solid-state methods such as Ohzuku have synthesized spinel type lithium titanate Li
4Ti
5O
12By TiO
2With Li
2CO
3Or lithium salts such as LiOH prepares through high temperature solid-state method, and reaction temperature is generally 800-1000 ℃, reaction time 12-24h.Obviously, the particle of the product of this prepared all compares slightly, all is micron order.
High-energy ball milling method: the method for human high-energy ball millings such as Zaghib is ground into nanoscale with common micron-sized lithium titanate, and its particle size probably is 600nm, and still, Zhi Bei nano lithium titanate does not improve significantly at chemical property in this way.
Sol-gel processing: the titanium of human stoichiometric proportions such as Gratzel and organic alkoxide of lithium are presoma, the nano lithium titanate that has prepared spinel-type through hydrolysis and colloidal sol-gel process, the nano lithium titanate of this method preparation has shown very excellent fast charging and discharging ability, even under the discharge rate of 250C, also kept very high capacity, but sol-gel processing need be with expensive organic alkoxide as presoma, and complex process, therefore be difficult to realize that large-scale industrial production satisfies the wilderness demand of energy field.
Along with the develop rapidly of nano material preparation technology, the application of nano material in lithium ion battery also more and more widely.Nano material has the incomparable advantage of conventional powder as lithium ion battery material, usually, the principal element of decision lithium ion battery charge-discharge velocity is that lithium ion is lower in the diffusion rate of electrode solid phase inside, obviously, if the reduction particle size just can be improved the charge-discharge characteristic of lithium ion battery.
The cheap industrial various TiO of the present invention
2Powder be feedstock production diameter less and even, the spinel lithium titanate Li that specific area is bigger
4Ti
5O
12Nanowires/nanotubes, preparation is simple, raw material is cheap and easy to get, and the productive rate height is suitable for large-scale industrial production.The spinel lithium titanate monodimension nanometer material of the present invention's preparation has showed excellent chemical property as the electrochemical lithium storage material, has wide practical use in novel lithium secondary battery and ultracapacitor.
Summary of the invention
The various titanium dioxide powders that the objective of the invention is to produce with general industry are raw material, prepare titanate radical nanopipe/nano wire with sonochemistry-hydro thermal method, titanate radical nanopipe/nano wire mixes with the solubility Aqueous Lithium Salts, after hydro-thermal ion-exchange and a series of postprocessing working procedures, be converted into lithium titanate nanowires/nanotubes with spinel structure.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method of synthetic titanate radical nanopipe/nano wire, this method is with the TiO of industrial various crystal formations
2Be raw material, in NaOH solution, through sonicated, hydro-thermal reaction and reprocessing obtain titanate radical nanopipe/nano wire.The concrete steps of this method are as follows:
The industrial titanium dioxide of 1～5 gram is mixed with the NaOH solution of 40 milliliter of 5～25 mol, place supersonic generator, carry out the sonochemistry reaction, ultrasonic power 0.2～100W/cm
2, 30～90 ℃ of temperature, 0.2～6 hour time; Move into then and carry out hydro-thermal reaction in the alkaline-resisting closed container, temperature is 90～255 ℃, time is 4 hours to 4 days, and white product with after excessive alkali separates, is neutralized to faintly acid with diluted acid, ageing, clean up with deionized water, with absolute ethyl alcohol exchange, oven dry, obtain titanate radical nanopipe/nano wire, its chemical formula is H
2Ti
nO
2n+1H
2O (n=2～5).At hydrothermal temperature is 90～150 ℃, when the concentration of NaOH is 5～15 mol, generates titanate radical nanopipe; At hydrothermal temperature is the concentration of 150～220 ℃ and NaOH when being 15～25 mol, mainly generates the metatitanic acid nano wire.
A kind of method of synthetic spinel lithium titanate nanowires/nanotubes, this method is a raw material with the titanate radical nanopipe/nano wire of above-mentioned preparation, add the ratio of 5～50 mM lithium salts mixes with the solubility Aqueous Lithium Salts in every gram nanowires/nanotubes raw material, with ammoniacal liquor mixed system is transferred to alkalescence, move into then and carry out hydro-thermal reaction in the alkaline-resisting high-pressure-resistant vessel, hydrothermal temperature is 100-200 ℃, and the reaction time is 4-48 hour.The hydro-thermal ion exchange product is cleaned with distilled water and alcohol respectively, and vacuumize obtains the spinel type lithium titanate nanowires/nanotubes after the 300-800 ℃ of roasting.
A kind of in lithium hydroxide, lithia, lithium carbonate, lithium nitrate, lithium sulfate, lithium phosphate, lithium chlorate, lithium fluoride, lithium chloride, lithium bromide and the lithium iodide that described solubility lithium salts is an inorganic lithium salt, or be a kind of in lithium formate, lithium acetate, lithium oxalate, lithium tartrate, lithium benzoate, acrylic acid lithium, lithium methoxide and the lithium ethoxide of organic lithium salt.
The invention has the beneficial effects as follows and adopt cheap industrial production TiO
2Be raw material, with sonochemical method/low-temperature hydrothermal ion-exchange, prepared the pattern homogeneous, uniform diameter has bigger draw ratio, the spinel lithium titanate nanowires/nanotubes that specific area is big.This product has wide practical use at new type lithium ion secondary cell and ultracapacitor equal energy source field.Sonochemical method is a kind of efficient height, energy consumption is low, speed is fast and eco-friendly chemical process, is called as " Green Chemistry process ", in conjunction with hydrothermal reaction at low temperature, the energy consumption of entire synthesis process is lower, equipment is simple, and condition is controlled easily, realizes large-scale industrial production easily.
Description of drawings
Fig. 1 is the TEM microstructure of spinel lithium titanate nanotube, about 9 nanometers of its diameter.
Fig. 2 is the TEM microstructure of spinel lithium titanate nano wire, about 100 nanometers of its diameter.
Fig. 3 is spinel lithium titanate nano wire high-resolution projection electron microscope (HRTEM) microstructure, and upper right corner illustration is an image K-M.
Fig. 4 is the powder diffraction XRD of spinel lithium titanate nanotube (b) and nano wire (c), (a) is the standard powder diffraction XRD of spinel lithium titanate.
The powder X-ray RD figure of Fig. 5 (a) titanate radical nanopipe ion exchange product under 60 ℃ and alkaline environment is the mixture of spinel lithium titanate and titanium dioxide; (b) the powder X-ray RD figure of titanate radical nanopipe ion exchange product under 120 ℃ and alkaline environment is the spinel lithium titanate of pure phase; (c) the powder X-ray RD figure of titanate radical nanopipe ion exchange product under 120 ℃ and weak acid environment is the anatase titania of pure phase.
The cyclic voltammetry curve of Fig. 6 spinel lithium titanate nanotube.
The cyclic voltammetry curve of Fig. 7 spinel lithium titanate nano wire.
The charging and discharging curve of Fig. 8 spinel lithium titanate nano wire under different charge-discharge magnifications.
The charge and discharge cycles stability of Fig. 9 spinel lithium titanate nano wire under different charge-discharge magnifications.
Embodiment
The present invention is a raw material with industrial various titanium dioxide at first, preparation titanate radical nanopipe/nano wire.In preparation process, make full use of cavitation effect of ultrasonic waves, material is pulverized, fully increase the contact area of titanium dioxide and alkali, simultaneously, the instantaneous local superhigh temperature superhigh pressure that utilizes ultrasonic wave to produce, the effect of having quickened titanium dioxide and alkali generates titanate.The titanate that generates has layer structure, and the titanate crystal growth of sheet under hydrothermal condition is rolled into titanate nanotube or further crystallization with layer structure then and generates the metatitanic acid nano wire with layer structure.Titanate nanotube/nano wire forms titanate radical nanopipe/nano wire after strong acid exchange, neutralization.Titanate radical nanopipe/nano wire is through further exchange of hydro-thermal lithium ion and reprocessing formation have the spinel lithium titanate nanowires/nanotubes of one-dimentional structure.The inventive method preparation process technology is simple, the condition controllability is strong, and reaction is quick, energy consumption is low, and raw material is cheap and easy to get, productive rate is high, is easy to realize large-scale industrial production.
Preparation technology of the present invention mainly comprises following two aspects:
1. be feedstock production titanate radical nanopipe/nano wire with industrial titanium dioxide
This method for preparing titanate radical nanopipe/nano wire makes full use of hyperacoustic pulverization, and large granular materials fully is ground into fine particle, increases the contact area between the material, reduces the resistance to mass tranfer of reaction; The instantaneous local superhigh temperature superhigh pressure that utilizes the ultrasonic cavitation effect to produce simultaneously, the carrying out of accelerated reaction utilizes low-temperature hydrothermal to carry out crystallization then, obtains titanate nanotube/nano wire.Form titanate radical nanopipe/nano wire through reprocessing.
Processing step: the industrial titanium dioxide of 1～5 gram is mixed with the NaOH solution of 40 milliliter of 5～25 mol, place supersonic generator, carry out the sonochemistry reaction, 30～90 ℃ of temperature, ultrasonic power 0.2～100W/cm
2, 0.2～6 hour time; Move into then and carry out hydro-thermal reaction in the alkaline-resisting closed container, temperature is 80～255 ℃, time is 4 hours to 4 days, and product with after excessive alkali separates, is neutralized to acidity with diluted acid, ageing 2～12 hours, use washed with de-ionized water, with the absolute ethyl alcohol exchange for several times, drying, obtain titanate radical nanopipe/nano wire, its chemical formula is H
2Ti
nO
2n+1(n=2～5).At hydrothermal temperature is 90～150 ℃, and when the concentration of NaOH was 5～15 mol, highly selective generated titanate radical nanopipe; At hydrothermal temperature is the concentration of 150～220 ℃ and NaOH when being 15～25 mol, and highly selective generates the metatitanic acid nano wire, and the condition that promptly generates nanotube or nano wire is controlled.
2. titanate radical nanopipe/the nano wire with method for preparing is a raw material, and preparation has the lithium titanate nanowires/nanotubes of spinelle crystal formation.
The method of this synthetic spinel lithium titanate nanowires/nanotubes, utilize the proximity of the ionic radius of the ion exchange property of metatitanic acid and lithium ion and titanium ion, utilize the hydro-thermal ion-exchange to be converted into lithium titanate nanowires/nanotubes by highly selective with spinelle crystal formation.Spinel structure can be used general formula AB
2O
4Expression, wherein, O atom close packed array, the A atom occupies the four sides position, and the B atom occupies the octahedral position.Spinel type lithium titanate can be expressed as Li[Li
1/3Ti
5/3] O
4, lithium ion occupies the four sides position, and 5/3 titanium ion occupies the octahedral position, has 1/3 lithium and titanium to occupy the octahedral position jointly simultaneously.The hydro-thermal ion-exchange provides the enough energy that are used for lithium ion exchange and migration, and exchange then can only obtain the spinelle phase of part under the normal temperature, can not get the spinel lithium titanate of pure phase.
Processing step: the titanate radical nanopipe/nano wire of above-mentioned preparation and the aqueous solution of solubility lithium salts are carried out the hydro-thermal ion-exchange reactions under 100～200 ℃, the reaction time is 4～48 hours.Use distilled water and alcohol peace and quiet respectively the hydro-thermal ion exchange product, vacuumize obtains the spinel type lithium titanate nanowires/nanotubes after 300～800 ℃ of roastings.A kind of in lithium hydroxide, lithia, lithium carbonate, lithium nitrate, lithium sulfate, lithium phosphate, lithium chlorate, lithium fluoride, lithium chloride, lithium bromide and the lithium iodide that used solubility lithium salts is an inorganic lithium salt, or be a kind of in lithium formate, lithium acetate, lithium oxalate, lithium tartrate, lithium benzoate, acrylic acid lithium, lithium methoxide and the lithium ethoxide of organic lithium salt.
Below be example with prepared titanate radical nanopipe/nano wire of the present invention and spinel lithium titanate nanowires/nanotubes.
Embodiment 1: the preparation of titanate radical nanopipe
Take by weighing the titania powder of 1 gram, 1.5 grams and 2.5 industrial anatases of gram or rutile crystal type respectively, put into conical flask, add 40 milliliters of NaOH solution that concentration is respectively 5 or 10 mol, put into supersonic generator, with 0.5W/cm
2Power ultrasonic 2 hours, temperature is 30～80 ℃.Move into then in 40 milliliters the autoclave of teflon lined, 110～120 ℃ of hydro-thermal reactions 20 hours are with white product and excessive alkali centrifugation, with the HNO of 0.1 mol
3Being neutralized to the pH value is 3～7, and ageing 8 hours is clean with rinsed with deionized water then, and with absolute ethyl alcohol exchange three times, drying can get titanate radical nanopipe again.Its molecular formula is H
2Ti
3O
7
Repeat the aforesaid operations step, with 100W/cm
2Power ultrasonic 0.2 hour, temperature is 60～80 ℃, can get titanate radical nanopipe.
Repeat the aforesaid operations step,, can get titanate radical nanopipe 90 ℃ of following hydro-thermal reactions 3 days.
Repeat the aforesaid operations step,, can get titanate radical nanopipe 150 ℃ of following hydro-thermal reactions 12 hours.
Product detects through TEM and is nanotube, about 8～10 nanometers of nanotube external diameter, and the about hundreds of nanometer of length is to micron order.Detecting product with the X-ray powder diffraction is metatitanic acid.
Embodiment 2: the preparation of metatitanic acid nano wire
Take by weighing 3 grams, 4 grams or the industrial anatase of 5 grams or the titania powder of rutile crystal type respectively, put into conical flask, adding concentration respectively is 40 milliliters of NaOH solution of 20 or 25 mol, puts into supersonic generator, with 0.5W/cm
2Power ultrasonic 2 hours, temperature is 30～80 ℃.Move into then in 40 milliliters the autoclave of teflon lined, 170～180 ℃ of hydro-thermal reactions 48 hours are with white product and excessive alkali centrifugation, with the HNO of 0.1 mol
3Being neutralized to the pH value is 5～7, and ageing 8 hours is clean with rinsed with deionized water then, and with absolute ethyl alcohol exchange three times, drying can get the metatitanic acid nano wire again; Its molecular formula is H
2Ti
3O
7
Repeat the aforesaid operations step, with 100W/cm
2Power ultrasonic 0.5 hour, temperature is 60～80 ℃, can get the metatitanic acid nano wire.
Repeat the aforesaid operations step,, can get the metatitanic acid nano wire 150 ℃ of following hydro-thermal reactions 4 days.
Repeat the aforesaid operations step,, can get the metatitanic acid nano wire 220 ℃ of following hydro-thermal reactions 12 hours.
Product detects through TEM and is nano wire, several microns to tens microns approximately of about 100 nanometers of nanotube external diameter, length.Detecting product with the X-ray powder diffraction is metatitanic acid.
Embodiment 3: the preparation of spinel lithium titanate nanotube
With a kind of in lithium hydroxide, lithia, lithium carbonate, lithium nitrate, lithium sulfate, lithium phosphate, lithium chlorate, lithium fluoride, lithium chloride, lithium bromide and the lithium iodide of the titanate radical nanopipe of embodiment 1 preparation and inorganic lithium salt or be that a kind of aqueous solution for the solubility lithium salts in lithium formate, lithium acetate, lithium oxalate, lithium tartrate, lithium benzoate, acrylic acid lithium, lithium methoxide and the lithium ethoxide of organic lithium salt mixes, regulate pH to alkalescence with ammoniacal liquor or LiOH, carry out the hydro-thermal ion-exchange reactions under 120 ℃, the reaction time is 24 hours.The hydro-thermal ion exchange product is cleaned with distilled water and alcohol respectively, and vacuumize in air, obtains the spinel type lithium titanate nanotube after 300～500 ℃ of roastings.Its molecular formula is Li
4Ti
5O
12
Repeat the aforesaid operations step, carry out the hydro-thermal ion-exchange reactions under 150 ℃, the reaction time is 12 hours.Can get the spinel lithium titanate nanotube.
Repeat the aforesaid operations step,, can get the spinel lithium titanate nanotube 200 ℃ of following hydro-thermal reactions 4 hours.
Product detects through TEM and is nanotube, and detecting product with the X-ray powder diffraction is the lithium titanate of spinelle crystal formation.Recording specific area with the BET method is: 237.6m
2/ g.Fig. 1 is the transmission electron microscope figure of spinel type lithium titanate nanotube, and Fig. 4 (b) is the powder diffraction XRD figure of spinel lithium titanate nanotube.
Embodiment 4: the preparation of spinel lithium titanate nano wire
The titanate radical nanopipe of embodiment 2 preparations and the aqueous solution of the solubility lithium salts among the embodiment 3 are mixed, regulate pH to alkalescence with ammoniacal liquor or LiOH, carry out the hydro-thermal ion-exchange reactions under 120 ℃, the reaction time is 48 hours.The hydro-thermal ion exchange product is cleaned with distilled water and absolute ethyl alcohol respectively, and vacuumize in air, obtains the spinel type lithium titanate nano wire after 500～800 ℃ of roastings; Its molecular formula is Li
4Ti
5O
12
Repeat the aforesaid operations step, carry out the hydro-thermal ion-exchange reactions under 150 ℃, the reaction time is 24 hours.Can get the spinel lithium titanate nano wire.
Repeat the aforesaid operations step,, can get the spinel lithium titanate nano wire 200 ℃ of following hydro-thermal reactions 12 hours.
Product detects through TEM and is nano wire, and detecting product with the X-ray powder diffraction is the lithium titanate of spinelle crystal formation.Recording specific area with the BET method is: 126.7m
2/ g.Fig. 2 is the transmission electron microscope figure of spinel type lithium titanate nano wire, Fig. 3 is spinel lithium titanate nano wire high resolution transmission electron microscopy (HRTEM) microstructure, upper right corner illustration is an image K-M, and Fig. 4 (c) is the powder diffraction KRD figure of spinel lithium titanate nano wire.
Comparative example 1
The titanate radical nanopipe of embodiment 1 preparation and the aqueous solution of solubility lithium salts are mixed, regulate pH to alkalescence with ammoniacal liquor or LiOH, carry out the hydro-thermal ion-exchange reactions under 60 ℃, the reaction time is 24 hours.Use distilled water and absolute ethyl alcohol peace and quiet respectively the hydro-thermal ion exchange product, vacuumize, in air, 300～500 ℃ of roastings 2 hours.Product characterizes through XRD, shows the spinel type lithium titanate that can not obtain pure phase, can only generate the mixture of spinel lithium titanate and anatase titania, shown in Fig. 5 (a).
Comparative example 2
The titanate radical nanopipe of embodiment 1 preparation and the aqueous solution of solubility lithium salts are mixed, and the pH of mixture is the neutral faintly acid that arrives, and carries out the hydro-thermal ion-exchange reactions under 120 ℃, and the reaction time is 24 hours.Use distilled water and absolute ethyl alcohol peace and quiet respectively the hydro-thermal ion exchange product, vacuumize, in air, 300～500 ℃ of roastings 2 hours.XRD shows that the product that obtains is the titanium dioxide of anatase crystal, can not obtain the spinel type lithium titanate nanotube, shown in Fig. 5 (c).
Comparative example 3
The metatitanic acid nano wire of embodiment 2 preparations and the aqueous solution of solubility lithium salts are mixed, and the pH of mixture is the neutral faintly acid that arrives, and carries out the hydro-thermal ion-exchange reactions under 120 ℃, and the reaction time is 48 hours.Use distilled water and absolute ethyl alcohol peace and quiet respectively the hydro-thermal ion exchange product, vacuumize, 500 ℃ of roastings 2 hours.Product is indicated as anatase titania through XRD, can not get the spinel type lithium titanate nano wire.
Embodiment 5 chemical properties-cyclic voltammetry
With spinel lithium titanate nanowires/nanotubes, conductive carbon black and the Kynoar (PVDF) of embodiment 3 or embodiment 4 preparations is the mixed of 80%:10～12%:8 ~ 10% according to weight ratio, with N-methyl pyrrolidone (NMP) is solvent, fully stirring becomes pastel even, good fluidity, be coated on equably on the aluminum foil current collector with the scraper casting technique then, form electrode diaphragm.Diaphragm through 80 ℃ predrying after, under 120～150 ℃, carry out concora crush, then intensive drying in 120 ℃ vacuum drying chamber.As to electrode and reference electrode, use 1M LiPF with metal lithium sheet
6/ (EC+DMC) be electrolyte, electrode diaphragm is that work electrode is assembled into button battery and carries out the cyclic voltammetric test.Fig. 6 and Fig. 7 are respectively the cyclic voltammetry curve of spinel lithium titanate nanotube and nano wire.Test result shows that the spinel lithium titanate nanowires/nanotubes has the performance that reversible lithium ion inserts and deviates from.Simultaneously, from cyclic voltammetry curve as can be seen, the peak current of its oxidation peak and reduction peak is suitable substantially.Because the diffusion rate of lithium ion in solid phase is very little, so the peak current of the spinel powder material of high-temperature solid phase reaction method preparation shows asymmetry usually.Showed the cyclic voltammetry curve of basic symmetry by the electrode of spinel lithium titanate nanowires/nanotubes preparation, shown with the spinel lithium titanate nanowires/nanotubes to be used as the dynamics that lithium ion battery electrode material can improve battery.
Because the spinel lithium titanate nanowires/nanotubes of method preparation of the present invention has big specific area, draw ratio is big, has the performance of excellence as the electrode material of lithium ion battery and ultracapacitor.
Embodiment 6 chemical properties-constant current charge-discharge test
's 80%: 10～12%: 8～10% mixed with spinel lithium titanate nanowires/nanotubes, conductive carbon black and the Kynoar (PVDF) of embodiment 3 or embodiment 4 preparations according to weight ratio, with N-methyl pyrrolidone (NMP) is solvent, fully stirring becomes pastel even, good fluidity, be coated on equably on the aluminum foil current collector with the scraper casting technique then, form electrode diaphragm.Diaphragm through 80 ℃ predrying after, under 120～150 ℃, carry out concora crush, then intensive drying in 120 ℃ vacuum drying chamber.As negative pole, use 1M LiPF with metal lithium sheet
6/ (EC+DMC) be electrolyte, electrode diaphragm is that positive pole is assembled into button battery and carries out the constant current charge-discharge test.Fig. 8 is the charging and discharging curve of spinel lithium titanate nano wire under different charge-discharge magnifications, and Fig. 9 is the charge and discharge cycles stability under the different charge-discharge magnifications.Test result shows that this model battery has a good discharge platform near 1.5V, and the model battery has the ability of good charge and discharge cycles stability and high current charge-discharge.The electrode material of the spinel lithium titanate nanowires/nanotubes preparation of the inventive method preparation is expected to become the novel lithium rechargeable battery material and the electrode material of ultracapacitor.
Claims (6)
1. spinel lithium titanate nanotube/line preparation method who is used for lithium battery and capacitor, it is characterized in that: this method comprises two steps of preparation of titanate radical nanopipe/nano wire and lithium titanate nanowires/nanotubes:
1) step of synthetic titanate radical nanopipe/nano wire is that the industrial titanium dioxide of 1～5 gram is mixed with the NaOH solution of 40 milliliter of 5～25 mol, places supersonic generator, carries out the sonochemistry reaction, ultrasonic power 0.2～100W/cm
2, 30～90 ℃ of temperature, 0.2～6 hour time; Move into then and carry out hydro-thermal reaction in the alkaline-resisting closed container, temperature is 90～255 ℃, time is 4 hours to 4 days, white product with after excessive alkali separates, is neutralized to faintly acid through the diluted acid with strong acid, ageing, clean up with deionized water, with the absolute ethyl alcohol exchange, oven dry obtains titanate radical nanopipe/nano wire; Wherein, being neutralized to faintly acid with the diluted acid of strong acid is HNO with 0.1 mol
3Being neutralized to the pH value is 3～7;
2) step of synthetic spinel lithium titanate nanowires/nanotubes is that the titanate radical nanopipe/nano wire for preparing with step 1) is a raw material, add the ratio of 5～50 mM lithium salts mixes with the solubility Aqueous Lithium Salts in every gram nanowires/nanotubes raw material, with ammoniacal liquor mixed system is transferred to alkalescence, move into then and carry out hydro-thermal reaction in the alkaline-resisting pressure vessel, hydrothermal temperature is 100-200 ℃, reaction time is 4-48 hour, again product is cleaned with distilled water and absolute ethyl alcohol respectively, after the vacuumize, in air, 300-800 ℃ of roasting, the time is 1～6 hour, obtains the spinel type lithium titanate nanowires/nanotubes.
2. according to the described spinel lithium titanate nanotube/line preparation method who is used for lithium battery and capacitor of claim 1, it is characterized in that: the chemical formula of described titanate radical nanopipe/nano wire is H
2Ti
nO
2n+1H
2O, wherein n=2～5; At hydrothermal temperature is 90～150 ℃, when the concentration of NaOH is 5～15 mol, generates titanate radical nanopipe; At hydrothermal temperature is the concentration of 150～220 ℃ and NaOH when being 15～25 mol, mainly generates the metatitanic acid nano wire.
3. according to the described spinel lithium titanate nanotube/line preparation method who is used for lithium battery and capacitor of claim 1, it is characterized in that: described calcining obtains in air spinel lithium titanate nanotube or nano wire, its chemical formula is Li
4Ti
5O
12
4. according to the described spinel lithium titanate nanotube/line preparation method who is used for lithium battery and capacitor of claim 1, it is characterized in that: the lithium salts of described solubility Aqueous Lithium Salts comprises inorganic salts or organic salt, and the pH scope of solubility Aqueous Lithium Salts is 9～14.
5. according to the described spinel lithium titanate nanotube/line preparation method who is used for lithium battery and capacitor of claim 4, it is characterized in that: described inorganic lithium salt is a kind of in lithium hydroxide, lithia, lithium carbonate, lithium nitrate, lithium sulfate, lithium phosphate, lithium chlorate, lithium fluoride, lithium chloride, lithium bromide and the lithium iodide.
6. according to the described spinel lithium titanate nanotube/line preparation method who is used for lithium battery and capacitor of claim 4, it is characterized in that: described organic lithium salt is a kind of in lithium formate, lithium acetate, lithium oxalate, lithium tartrate, lithium benzoate, acrylic acid lithium, lithium methoxide and the lithium ethoxide.
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| CNB2005100800845A CN1333474C (en) | 2005-06-29 | 2005-06-29 | Preparation method of spinel lithium titanate nano tube/wire for lithium battery and capacitor |
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| CN1333474C true CN1333474C (en) | 2007-08-22 |
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| CN100426568C (en) * | 2006-06-12 | 2008-10-15 | 北京科技大学 | Method of synthesizing lithium ion cathode material lithium titanium oxide using solvent heating method |
| CN101327949B (en) * | 2008-05-26 | 2010-06-09 | 武汉理工大学 | Preparation of one-dimensional titanate radical nanopipe material and use thereof |
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| CN104201364A (en) * | 2014-09-15 | 2014-12-10 | 李建明 | Method for preparing spinel lithium titanate |
| CN105271388A (en) * | 2015-10-10 | 2016-01-27 | 同济大学 | Preparation method of high specific surface area ultralong TiO2 nanotube |
| CN105513821B (en) * | 2016-01-21 | 2017-11-03 | 东南大学 | Nitrogenize lithium titanate nanotube/nanometer film integrated material and its preparation method and application |
| CN105655148B (en) * | 2016-01-21 | 2018-02-02 | 东南大学 | A kind of nitridation lithium titanate nano wire/nanometer film integrated material of nano-porous structure and its preparation method and application |
| US11145890B2 (en) | 2016-03-31 | 2021-10-12 | GM Global Technology Operations LLC | Encapsulated lithium titanate for lithium ion batteries |
| CN111630701A (en) * | 2017-09-14 | 2020-09-04 | 尼欧梅特丽有限公司 | Synthesis of lithium titanate |
| CN108288703B (en) * | 2018-01-31 | 2021-02-05 | 中南大学 | Preparation method and application of graphene-coated fluorine-doped lithium titanate nanowire |
| CN109326791B (en) * | 2018-09-03 | 2021-08-03 | 中国石油天然气股份有限公司 | Linear porous lithium titanate material and preparation and product thereof |
| CN110963473B (en) * | 2019-12-23 | 2022-12-27 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of carbon/titanium nitride nanotube composite material |
| CN112408467A (en) * | 2020-11-23 | 2021-02-26 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of lithium titanate positive electrode material |
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Assignee: Jiangsu CEL Battery Co., Ltd. Assignor: Tsinghua University Contract record no.: 2010110000218 Denomination of invention: Preparation method of spinel lithium titanate nano tube/wire for lithium battery and capacitor Granted publication date: 20070822 License type: Common License Open date: 20060125 Record date: 20101227 |
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